Furnace air-feeding mechanism.



No. 819,669. PATENTBD MAY 1, 1906.

W. MQOLAVE. FURNACE AIR FEEDING MECHANISM.

APPLICATION FILED IEB.-9.1906.

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PATBNTED MAY 1, 1906.

W. MoGLAVB. FURNACE AIR FEEDING MECHANISM.

APPLICATION FILED F113. 9, 1906.

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Wibwmoao UNITED sTA'r-Es PATENT OFFICE.

WILLIAM hiCCLAVE, OF SORANTON, PENNSYLVANIA, ASSIGNOR TO MoCLAVE-BROOKS COMPANY, A CORPORATION OF PENNSYLVANIA.

FURNACE AIR-FEEDING MECHANISM- N 0. 819,669. Specification of Letters Patent.

To aZZ w/wm it may concern:

Be it known that I, WVILLIAM MoCLAvE, a citizen of the United States, residing at Scranton, in the county of Lackawanna and State of Pennsylvania, have invented certain new and useful Improvements in Furnace Air- Feeding Mechanisms; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

his invention relates to improvements in air-feeding mechanism for provided with the usual fire-box 3, preferably arranged forwardly of the boiler and provided with the usual grate 4. Above the grate the fire-box is provided with a covering consisting of a pair of concentric arches spaced apart vertically, as seen at and 6. The arches 5 and 6 are spaced apart a sufficient distance for leavin an air chamber or space 7, which is arch-s aped and extends over practically the entire space above the arch 5. The front portion of the arch 6 is formed with a series of radial apertures 8, leading to the front end of the space 7. The outer ends of the apertures or passages 8 communicate with registering apertures or passages 9 9, formed vertically in the filling controlling devices.

The object in view is the supplying of heated air through the front arch at a point above the fire-box and the controlling of the quantity of air supplied. This object is accomplished by the employment of certain novel constructions, combinations, and arrangements of parts, as will be hereinafter fully described and claimed.

The passages 9 are spaced apart equidistant, and a plate 11 is secured on the flat horizontal face of the filling and is formed with transverse apertures 12 12, registering with the passages 9. The plate 11 serves simply as a wearing-plate, and.

In t e accompanying drawings, Figure 1 a slide 13 is mounted to move longitudinally is a lon tudinal vertical section throu h the thereof. The slide 13 is slotted at its ends, front portion of the furnace embodym the as at 14 14, and pins 15 15 are passed through features of the present invention, the section said slots for guiding the slide in its longitueing taken on the plane of line 1 1 of Fig. 3. dinal movement. A pair of lugs 16 are Fig. 2 is a top plan view of the parts seen in formed integral with or COIlDGCtGCl to the Fig 1, the boiler portion being omitted and a slide 13, and a link 17 is pivotally connected thereto by a transverse pin 18. The link 17 extends to and is pivotally connected with the crank 19, fixed to a rock-shaft 20. A crank 21 is fixed to the shaft 20 at its outer end and carries an operating-rod 22, depending therefrom and extending to a point facilitating operation.

he space or chamber 7 between the arches d 6 at the rear end thereof is partially closed by a series of blocks or bricks 23. The blocks 23 are small passages or spaces 24 thereb seen best in Fig. 2, the said blocks .addition to producing passages, to aid in sustaining the inner end of the arch 6, whereby the elements supported by the arch 6 will have their Weight sustained by both and 6. The special advantage of producing the reduced passages 24 lies in the fact that the air within the chamber 7 will be retarded thereby and. given opportunity to become heated and after such heating will be discharged with considerable velocity, so as to broken away for isclosing the interior structure. Fig. 3 is a view in front elevation of the parts seen in Fig. 2, a portion of the front wall of the arch being broken for disclosing the interior structure. Fig. 4 is a fragmentary detail view, partially in section and partially in elevation, indicating the relation of the draft-controlling slide.

he present improved air-feeding mechanism may be utilized in conjunction with any of the common forms of furnaces, and therefore the detail construction of the furnace has not been illustrated, only such portions thereof being shown as will facilitate an understanding of the embodiment of the invention illustrated.

he invention is illustrated as being applied to an ordinary type of boiler-furnace, and the tubes of the boi er are indicated at 1, which tubes are supported by the inclosing walls 2 of the furnace in the ordinary and usual manner. The said inclosing walls are etween, as serving, in

arranged for leaving relatively.

the arches 5 be injected into the column of flame passing over the bridge-wall 25, arranged in the rear of the fire-box 3.

The inner upper edge of the arch 5 is preferably formed with the beveled portion 26, which serves to prevent collections of dust or foreign substances in the ends of the passages 24;.

The air-inlet ports or apertures 8 and 9 can be formed in any preferred manner in the brickwork of the arch 6 and in the filling 10 above the same; but I preferably form the same by arranging the bricks adjacent the openings in a zigzag manner, as indicated in Fig. 2, every other brick extending forwardly of the next contiguous brick. The apertures thus formed are of course approximately square in cross-section.

For the purpose of facilitating the cleaning of the space 7 suitable apertures 27 27 are formed in the arch 6, which permits access to the said space and which may be used for supplying fluid under pressure for blowing out deposits within the space 7.

In operation the column of flame and products of combustion arising from the grate 3 pass over the bridge-wall 25 and produce a partial vacuum in the front portion of the furnace-inclosure, which causes the outside to enter the apertures 9, assuming the slide 13 to have its apertures in register with the apertures of plate 11. The cold air entering the chamber 7 moves longitudinally thereof rearwardly and is subjected to the heat of the arch 5 and has its temperature raised thereby until, arriving at the apertures or passages 24:, the air is injected into the said column of flame and products of combustion. The mixture occurs at just the proper time for facilitating the consumption of imperfectly-consumed particles, whose incompletely-burned condition is due to lack of supply of oxygen.

ile I have illustrated a slide controlling anatural draft, it is obvious that it is immaterial, as far as the operation of the heatingchamber 7 is concerned, whether the air be supplied thereto by natural draft or under ressure. In the controlling of the admission of air through the passages 8 and 9 the slide 13 is moved longitudinally in one direction by pulling downwardly-upon the rod 22 and moved in the opposite direction by pressing upwardly thereon, the rock-shaft 20 being oscillated and the crank 19 bein actuated by the said movements of the rod 22 for reciprocating the link 17 and correspondingly actuating the slide 13, the said slide being guided in its movement by. the pins 15 engaging the slots 14:.

As clearly seen in Figs. 2 and 4, the plates 11 and 13 are formed of metallic straps, an the plate 11 constitutes a bed-plate secured position for adapting itself to the variable expansion and contraction of the arch due to heating and cooling formed of the plate the admission of air between the air from thereof. The damper or strap 13 will of course closely follow the bed-plate 11 and prevent the two straps or plates, while the bed-plate prevents the admission of air between itself and the arch or filling on which it rests. By this construction the supply of air may be readily controlled and no undesirable air-admission openings will be produced regardless of the uneven expansion or contraction of various parts of the arch.

The subject-matter of this application is a division of my application filed March 16, 1905, Serial No. 250,469, for improvements in furnaces.

Having now described my invention, I claim as new, and desire to secure by ters Patent, is

1. In a furnace air-feeding mechanism, the combination with a furnace-inclosure having afire-box therein, of concentric arches spaced apart and arranged above said fire-box and forming a heating chamber therebetween, radial passages being formed through one of said arches and communicating with the front end of said chamber, the rear end of the chamber being open to the interior of the fun nace inclosure, and a filling supported on said arch above said passages and formed with vertical passages communicating with said radial passages, and means for controlling admission of air to the said vertical passages.

2. In a furnace air-feeding mechanism, the combination with a furnace-inclosure having a fire-box, of two arches spaced from each other to form an air-chamber in communication with the fire-box, the upper arch being provided with air-admitting passages communicating with the air-chamber, a metallic bed-plate. sustained by the upper arch and formed with apertures registering with the air-admitting passages of the arch, and a metallic, aperture damper mounted on said bed-plate and adapted .to be moved for causing its apertures to move into and out of register with the apertures in the bed-plate.

what Let- 3. In a furnace air-feeding mechamsm, the

combination with a fuInace-inclosure having a fire-box, of an arch arranged above the same, a superimposed arch spaced above the first-mentioned arch and forming an airchamber between the two arches, the said air-chamber communi ating at its inner end with the furnace-inclosure, air-passages being formed in the upper arch for supplying air to the air-chamber, a metallic bed-plate provided with openings registering with the said air-passages, a metallic slide formed with apertures and means for moving said slide for bringing the apertures thereof into or out of register with the openings in said bedplate.

4. In a furnace air-feeding mechanism, the

other to form an air-feeding chamber in c0mt e apertures of the bed-plate, and means munieation with the fire-box, one of the or guiding the damper in its movement.

5 arches being provided With airadmitting In testimony whereof I alhx my signature passages communicating with the air-cham- 'in presence of tWo Witnesses. her, a metallic bed-plate sustained by the arch having the air-admitting passages and WILLIAM MOOLAVE' formed With apertures registering With said Witnesses:

to air-admitting passages, a metallic, apertured EDGAR M. KITOHIN, damper slidingiy engaging said bed-plate and JOHN L. FLETCHER. 

